Plow-chill



(No Model.)

W. B. SEWARD.

Plow Chill.

No. 232,305. Patented Sept. 14,1880.

UNITED STATES PATENT OFFICE.

WILLIAMSON B. SEIVARD, OF BLOOMINGTON, INDIANA.

PLOW-CHILL.

SPECIFICATION forming part of Letters Patent No. 232,305, dated September 14, 1880.

Application filed August .2, 1880. (No model.)

To all whom it may concern:

Be it known that I, WILLIAMSON B. SEW- ARD, of Bloomington, in the county of Monroe and State of Indiana, have invented certain new and usefulImprovements iu Plow-Chills; and I do hereby declare that the following is a full, clear, and exact description thereof, ref erence being had to the accompanying drawings, and to the letters of reference marked thereon, which form part of this specification.

This invention is particularly designed to furnish an improved chill for casting articles having large or extended surfaces, such as moldboards for plows and the like, although it is applicable to all other kinds of castings.

In the manufacture of chilled castings, es-

pecially such as have extended surfaces, great difficulty has been experienced in producing a perfect casting evenly chilled over the entire surface, owing to the fact that the air contained in the mold and the steam and gases generated therein by the intense heat of the molten metal when poured into the mold are confined, in part, between the molten metal and the chill, constituting a cushion, which prevents perfect contact of the molten metal with the chill, resulting in a defective or im- 'ierfectly-chilled casting. Often there is such an accumulation of air, steam, and gas in places over the chill-as to form large holes partly, and sometimes entirely, through the casting, rendering it utterly worthless.

The object of my invention is to obviate these objections; and to this end it consists in a chill of such shape as to exactly conform to the shape of the surface of the casting to be chilled, and provided with a number of openings so formed and of such size as will admit of their being partially plugged so that while the air, steam, and gases contained and generated in the. mold by the heat of the molten metal can freely escape, the molten metal itself can find no egress through said openings.

Referring to the accompanying drawings, Figure 1 represents a perspective view of a flask containing my chill; Fig. 2, a similar view of part of my chill, showing the peculiar mode of forming the gas-openings; and Fig. 3, a similar view of the plug.

The letter A indicates my improved chill, constructed of metal, as usual, and which, in the present instance, is represented as achill for mold-boards. The said chill is made to conform accurately to the shape of the surface to be chilled in the casting.

The letter B indicates a series of openings or apertures formed in the chill. The said apertures are made much larger than the size ultimately intended, and of any desired shape or configuration, and are then brought to the proper ultimate size and shape by filling them partly with suitably-shaped plugs O, of proper size. In the present instance the openings are represented as rectangular in shape, and the plugs of like contiguration,cach plug being recessed on opposite sides, as indicated by the letter D, so as to leave narrow openings for the escape of air, steam, and gas, but which will prevent the escape of the molten metal.

The chill as thus constructed is employed in connection with a pattern and flask in the manner well known to founders, and therefore further explanation on this point is deemed unnecessary.

I am aware that chills have been heretofore constructed with small apertures for the purpose of ventilation; but, owing to the thickness of the metal necessary to the proper durability of the chill, and the necessarily small size of the apertures to prevent the iron from flowing through or filling them up, and the number requisite to properly ventilate the mold, this plan is exceedingly expensive, and, moreover, does not effectually accomplish the result sought.

By forming the apertures larger than ultimately intended it is evident that the whole chill may be constructed of cast metal, and the apertures, by the subsequent plugging or filling, may be made sufficiently narrow to prevent the escape of metal, which has hitherto gas from the mold, and at the same time efonly been effected by drilling the apertures-at fectually retain the molten metal, substanvery expensive and troublesome operation. tially as herein set forth.

Having thus described my invention,what I In testimony that I claim the foregoing as 15 5 claim, and desire to secure by Letters Patent, my own I affix my signature in presence of is two witnesses.

A chill for mold-boards and other castin s a formed of cast metal with a series of apTsr WILLIAMbON SLWABD' tnres, which are provided with partial fillings, Witnesses I0 whereby the apertures are reduced to proper MORTON O. HUNTER,

size to permit the free escape of air, steam, or JOHN CORY HUNTER. 

